Table 2.

Comparison of adult pre-B ALL engraftment by either unconditioned (−TBI) or 2.5-Gy preconditioned (+TBI) xenotransplantation methods

Major cytogenetic group	No. of engrafting samples		P
	+TBI	−TBI
Normal/other	7/7	0/6	.0006
t(9;22)	3/3	0/4	.0286
t(4;11)	1/2	2/3	NS
Proportion of engrafting samples: % leukemic engraftment Mean no. of weeks to disease manifestation (range)*
	11/12	2/13	.0394
	81.9 ± 5.4	96.4 ± 1.4	NS
	15.9 (5.9-29.7)	27.7 (26.9-29.3)	.0231

NS, nonsignificant.

^*The number of samples with leukemic engraftment (CD45⁺/CD19⁺ > 0.01%) over the total number injected is shown.